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(2x-4)(x-2)=0
We multiply parentheses ..
(+2x^2-4x-4x+8)=0
We get rid of parentheses
2x^2-4x-4x+8=0
We add all the numbers together, and all the variables
2x^2-8x+8=0
a = 2; b = -8; c = +8;
Δ = b2-4ac
Δ = -82-4·2·8
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$x=\frac{-b}{2a}=\frac{8}{4}=2$
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